Hot-blast stove.



W. MATHBSIUS.

HOT BLAST STOVE. .APPLIUATION FILED ooT.1o, 1911.

Patented F6120, 191g coLuMmA PLANOGRAPH co.. WASHINGTON. D. c

To all whom it mai/concern:

N UNiTED STATES, PATENT OFFICE.

4 WALTHER MATHESIUS, OF CHARIOTTENBURG, GERMANY.

HOT-BLAST STOVE.

Be it known that I, WALTER MATHESIUS, a subject of the King of Prussia,and resident of 10 Carmerstrasse, Charlottenburg, near Berlin, GermanEmpire, have invented certain new and useful Improvements in Hot- `BlastStoves, of which the following is a specification. y

This invention relates to certain improvements in hot blast stoves oft-he Cowper type but in which the combustion chamber is arrangedcentrally in the apparatus so as to reduce the loss due to radiation ofheat, and in which the combustion chamber is surrounded by concentricannular flues through which the gases pass in a "zig-zag course, aninner cupola or dome for directing the path of the gases being providedWithin the usual outer cupola.

Heretofore the practical utility of apparatus of this type has beenfrustrated owing tothe fact that the inner cupola was not held rigidlyin position independentlyv of the walls of the flues, but was carried bythe` formed between the elongated flues and the vcupolas. The latter aremoreover carried by the outer ironv shell of the stove sothat the fluewalls only require to support their own weight.

My invention also comprises means for creating as long a flame aspossible in the combustion chamber so as to attain better utilization ofthe heat from the combustion.

Specification of Letters Patent.

Application led October 10, 1911.

Patented Feb. 20, 1912.

serial No. 653,844.

chamber' 1 are annular iiue walls 5 and 6 i on the line A-B of formingflue spaces 7 and 8 respectively,

and around the outer iiue wall 6 is provided checkered brickwork 9between the wall 6 and an outer wall 10, which latter is surrounded bythe iron shell 11. Below the checkered brickwork 9 is a flue space `12communicating through a conduit 13 with the chimney. As will be readilyseen from Fig. 1,'the flue wall 5 is continued upwardly and passescentrally through the larger cupola 14 which is supported on a framework15 carried by the outer shell 11, the joint-between the flue wall 5 andcupola 14 being packed by means of a ring 16 so that the wall 5 is freeto slide therethrough while forming a gas tight joint. The ironframework 15 also carries an outer iron shell 23 and a gauntree 24 whichsupport a smaller cupola 17 litting over the flue wall 5 and if desiredthe space 18 between the cupola 17 and wall 5 may also be packed. Thewalls 5 and 6 are supported by the lower masonry 2 and the wall 5 cutaway below at 19 to provide communication between the llues 7 and 8. Thewall 5 also carries supporting webs 20 whereby theA whole internalstructure is supported in position.

21 is the cold air blast inlet pipe.

From the foregoing description it will be readily understood that thegas and air entering the combustion chamber 1 by way of `the conduits 3and 4, the flame will rise in a spiral path in the chamber and thus comeinto close contact with the wall of the chamber 1 and rising therein,complete combustion will take place in the space 22 in the upper part ofthe stove, thel gases passing down the iue 7 and through the opening 19into the flue 8. The gases rising therein will then pass down throughthe checkered about one fourth that of the cupolas of the Cowper stovenow in general use.

As the wall of the combustion chamber 1 terminates some distance belowthe flue wall v5, the gases have opportunity to fully miX in the largespace 22 thus available and can complete their combustion therein. ThestufIing-box form of joint between the flue wall 5 and the cupolasprevents the gases escaping and also enables free expansion andcontraction of the parts relatively to one another.

It has been found that the temperature of the gases in the cupola 14:seldom exceeds 800o C. so that the loss due to radiation is stillfurther reduced. i

It will thus be seen that a stove is obtained in which leakage isobviated'and the lifeand eiiciency of which arev considerably increasedas compared with previous constructions.

I claim 1. A hot blast stove comprising a central combustion chamber towhich the furnace gases and air may be supplied, an outerconcentricicylindricalwall projecting above the combustion chamber, anlannular flue being formed between said wall and combustion chamber,outer concentric annular flues communicating with the inner flue, anouter iron shell, a centrallyapertured dome supported by ysaid shell,said cylindrical wall passing through said dome, an eXpansible jointbetween said dome and cylindrical wall and a cupola fitted over saidcylindrical wall and supported by said outer iron shell. Y Y

2. In a hot blast stove, a cylindrical combustion chamber, means forsupplying air and gases to the combustion chamber so as to increase thelength of the flame and cause the same to rise spirally in said chamber,comprising air and gas conduits opening tangentially into the lower partof said chamber.

3. In a hot blast stove, a cylindrical combustion chamber, means forsupplying air and gases to the combustion chamber so as to increase thelength of the flame and cause the same to rise spirally in said chamber,comprising air and gas conduits opening in parallel direct-ions andtangentially int-o the lower part of said chamber.

In witness whereof I have hereunto set my hand in the presence of twowitnesses.

Y WALTHER MATHESIUS.,

Witnesses HENRY HAsPER, WOLDEMAR HAUPT.

Copies of tliis patent may be obtained for ve cents each, by addressingthe Commissioner of Patents. Washington, D. C.

